As a rapidly expanding urban and suburban area, Houston, TX, is prime real estate for raccoons. While their tendency to rummage through trash cans may be a mere nuisance, the diseases and parasites these pests harbor pose a threat to city residents. Raccoons in Houston are known carriers of diseases such as leptospirosis and rabies. Likewise, their feces may contain roundworm eggs, which are easily passed to pets and humans. The nocturnal pests are also prone to denning in attics, where their incessant scratching noises keep residents up at night. Once inside, raccoons may breed, spread fleas, and tear up insulation or wiring.